Turnkey ADU Construction in Orange County, CA

Orange County Master ADU Construction specializes in turnkey ADU construction, providing a complete solution from ADU design and construction to final build. Our team of experienced contractors manages every step of your ADU project, including permitting and approvals, so you don’t have to coordinate multiple contractors.


We deliver full-service ADU construction that saves time and reduces stress, offering custom ADU construction tailored to your needs. As a trusted ADU construction company, we ensure quality workmanship and handle your ADU build from start to finish, giving you a seamless experience with clear communication and expert ADU construction services.

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Our Turnkey ADU Construction Services

We handle every step of your ADU project to make the process simple. From managing the work schedule to securing permits and creating custom designs, our team takes care of it all.

Full-Service Project Management

We coordinate every part of the construction process. This includes scheduling, budgeting, hiring skilled subcontractors, and making sure the work meets our quality standards.


Our project managers communicate with you regularly. We keep you updated on progress and any changes to avoid surprises. We also handle unexpected issues quickly to stay on track.


By managing everything, we reduce stress for you. Our goal is to deliver the completed ADU on time and within budget.

Custom Design and Architecture

We create designs that fit your needs and match your home’s style. Our architects work with you to plan layouts that maximize space, light, and functionality.


You can choose from many options like open floor plans, smart storage, or eco-friendly materials. We make sure your ADU meets local building codes and fits your lifestyle.


Our team uses 3D models so you can see your ADU before construction begins. This helps you make informed decisions about design features.

Permitting and Approvals



We handle all the paperwork to get your ADU approved by city officials. This includes submitting plans, handling inspections, and meeting zoning rules.


Navigating Orange County’s permitting process can be complex. We have experience with local regulations and work to avoid delays.


Our team stays in touch with city departments and resolves any issues that come up. This helps keep your project moving smoothly through all required approvals.

Types of ADUs We Build

Detached ADUs

Detached ADUs are separate buildings from the main house. They offer complete privacy for both you and your guests or renters. Because they don’t share walls, sound and space conflicts are minimized.


These are ideal for larger yards where adding a standalone unit is possible. We handle everything from foundation to roofing. Detached ADUs usually include full kitchens, bathrooms, and living areas.


We help with site planning to meet local regulations and zoning rules. They take more time to build but can add significant value to your property.





Attached ADUs

Attached ADUs connect directly to your main home but have a separate entrance. This type is good if you want easier access between units while keeping privacy.


They often involve adding a wing, basement, or back unit. Attached ADUs cost less than detached ones because they use part of the existing structure. We focus on blending design so the addition matches your home’s style.


These units typically include bedrooms, bathrooms, and small kitchen areas. We make sure all work meets building codes and keeps your home safe.




Garage Conversions

Garage conversions turn existing garage space into livable ADUs. This option is quicker and more affordable than building new structures because it uses what you already have.


We convert garages into comfortable living spaces with bedrooms, bathrooms, and kitchens if space allows. Electrical and plumbing upgrades are part of the process, too.


This option maximizes your property without expanding your footprint. Garage conversions work well when your garage is underused or empty.


We ensure the final ADU meets local building standards for safety and comfort.

Why Choose Orange County Master ADU Construction


Expert Local Knowledge


We understand Orange County’s building codes and permit requirements inside and out. This helps us avoid common delays and makes the process faster for you.


Our team has worked on many ADUs across different neighborhoods. We know what designs work best for each area’s style and layout. This local insight ensures your ADU fits perfectly into your property. By staying updated with regional regulations, we help you avoid costly mistakes. We handle all the paperwork so you don’t have to worry about it.



Transparent Pricing and Timelines


We provide clear, detailed quotes before starting any work. You’ll know exactly what is included — from materials to labor — with no hidden costs. Our project timelines are also realistic. We give you a good estimate upfront and keep you informed if there are any changes. This way, you can plan ahead without surprises.


Payments are broken down into easy-to-understand milestones. You only pay as work is completed, so you have control over the budget.



Customer Satisfaction Guarantee


Our goal is to meet your expectations every step of the way. We listen closely to your needs and adjust plans as needed. We offer a warranty on our work to give you peace of mind. If anything needs fixing after completion, we handle it promptly.


Customer feedback is important to us. We maintain open communication, making sure you are satisfied before, during, and after construction.

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FAQs about Turnkey ADU Construction

  • How do Orange County regulations impact ADU construction projects?

    Orange County has specific rules on size, setback, and use for ADUs. We make sure your project meets these rules to avoid delays. Following these regulations helps your ADU stay legal and safe.

  • What are the estimated costs for building an ADU with a turnkey service in Orange County?

    Costs vary based on size and design choices. On average, turnkey ADUs in Orange County range from $150,000 to $300,000. We provide detailed quotes during the planning phase.

  • How do you ensure compliance with local building codes and permits?

    We stay updated on all local building codes and standards. Our experts handle the permit process from application to approval. We regularly inspect site progress to maintain full compliance.

  • Do we offer customization options?

    Yes, we offer many design choices. You can pick styles and features that fit your needs.

  • How long does it take to build an ADU?

    Most projects take a few months. The exact time depends on the size and complexity of the ADU.